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Reduction of Interrill Erosion by different application methods of Polyacrylamide and Gypsum

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 29 March - 3 April 2008, Concepcion, Chile  701P0208cd.(doi:10.13031/2013.24309)
Authors:   Salvador F Acuña, L Darrell Norton, Eusebio Jr Ventura
Keywords:   Polyacrylamide, gypsum, soil, interrill erosion

Soil erosion has been studied from different perspectives. This paper presents results on interrill erosion for three different application methods of Polyacrylamide (PAM) and Gypsum. Small interrill plots (0.74 m2) were packed with a highly erodible sieved soil and surface was prepared for it to have a geometrically ordered rough (GOR) surface. Soil was brought to saturation from below for a 24-hour period. The soil surface was amended with PAM and gypsum at rates of 20 kg ha-1 and 1 MT ha-1, respectively, before a de-ionized rainfall event at a target intensity of 44 mm hr-1. During rainfall the soil had a -10-cm tension and samples of runoff were collected at 5-minute intervals for one hour after runoff or until steady state runoff conditions were obtained. Soil loss was determined by measuring gravimetrically the sediment concentration in the runoff and runoff calculated as a function of time. Treatments were: PAM in solution plus powdered gypsum, granulated PAM plus powdered gypsum, and pelletized PAM and gypsum. Three replications for each treatment were performed. We found a reduction in soil erosion when PAM and gypsum were applied to the soil surface, regardless of what application method was used. Soil erosion was reduced in a range of one forth to a half of that found for the GOR control. The recommended application method is Gypsum and PAM pelletized together and applied at a rate of 1 MT ha-1, due to an easier application and being statistically the same or better than the other application methods.

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